Changes between tagged Emscripten versions are recorded in the ChangeLog. This log includes high-level information about new features, user-oriented fixes, options, command-line parameters, usage changes, deprecations, significant internal modifications, optimizations, etc. The log for each version links to a detailed diff report, which lists all the incremental changes since the previous release.

In addition, the mailing list is used to announce each new SDK release; these announcements include additional informal release notes and “highlights” information. The easiest way to find these posts is to use this search.